#include<stdio.h>
int main()
{
	double a,b,c;
	printf("Please enter tree numbers.\n");
	scanf("%lf %lf %lf",&a,&b,&c);
	if(a<b+c&&b<a+c&&c<a+b)
		printf("Valid.The circumference is %lg\n",a+b+c);
	else
		printf("Invalid.\n");
	return 0;
}
